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关于golang:聊聊gost的GoUnterminated

本文次要钻研一下 gost 的 GoUnterminated

GoUnterminated

gost/runtime/goroutine.go

// GoUnterminated is used for which goroutine wanna long live as its process.
// @period: sleep time duration after panic to defeat @handle panic so frequently. if it is not positive,
//          the @handle will be invoked asap after panic.
func GoUnterminated(handle func(), wg *sync.WaitGroup, ignoreRecover bool, period time.Duration) {
    GoSafely(wg,
        ignoreRecover,
        handle,
        func(r interface{}) {
            if period > 0 {time.Sleep(period)
            }
            GoUnterminated(handle, wg, ignoreRecover, period)
        },
    )
}

GoUnterminated 办法提供 handle、WaitGroup、ignoreRecover、period 参数,其外部应用的是 GoSafely,只是 catchFunc 是内置的;catchFunc 对于 period 大于 0 的会 sleep 一下,之后还是执行 GoUnterminated,这样子在 handle 出错 (panic) 的时候会始终递归循环上来

实例

gost/runtime/goroutine_test.go

func TestGoUnterminated(t *testing.T) {times := uint64(1)
    var wg sync.WaitGroup
    GoUnterminated(func() {if atomic.AddUint64(&times, 1) == 2 {panic("hello")
            }
        },
        &wg,
        false,
        1e8,
    )
    wg.Wait()
    assert.True(t, atomic.LoadUint64(&times) == 3)

    GoUnterminated(func() {atomic.AddUint64(&times, 1)
    },
        nil,
        false,
        1e8,
    )
    time.Sleep(1e9)
    assert.True(t, atomic.LoadUint64(&times) == 4)
}

这里模仿了一下 handler 在 times 为 1 的时候产生 panic,以及 handler 不产生 panic 就立即完结的场景

小结

gost 提供了 GoSafely 办法,该办法提供 handle、WaitGroup、ignoreRecover、period 参数,其外部应用的是 GoSafely,只是 catchFunc 是内置的;catchFunc 对于 period 大于 0 的会 sleep 一下,之后还是执行 GoUnterminated,这样子在 handle 出错 (panic) 的时候会始终递归循环上来。

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